Examples:SpaceInvaders ShipEntity

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package org.lwjgl.examples.spaceinvaders;
/**
* The entity that represents the players ship
*
* @author Kevin Glass
* @author Brian Matzon
*/
public class ShipEntity extends Entity {
/** Right border at which to disallow further movement */
private static final int RIGHT_BORDER = 750;
/** Left border at which to disallow further movement */
private static final int LEFT_BORDER = 10;
/** The game in which the ship exists */
private Game game;
/**
* Create a new entity to represent the players ship
*
* @param game The game in which the ship is being created
* @param ref The reference to the sprite to show for the ship
* @param x The initial x location of the player's ship
* @param y The initial y location of the player's ship
*/
public ShipEntity(Game game,String ref,int x,int y) {
super(game.getSprite(ref), x, y);
this.game = game;
}
/**
* Request that the ship move itself based on an elapsed ammount of
* time
*
* @param delta The time that has elapsed since last move (ms)
*/
public void move(long delta) {
// if we're moving left and have reached the left hand side
// of the screen, don't move
if ((dx < 0) && (x < LEFT_BORDER)) {
return;
}
// if we're moving right and have reached the right hand side
// of the screen, don't move
if ((dx > 0) && (x > RIGHT_BORDER)) {
return;
}
super.move(delta);
}
/**
* Notification that the player's ship has collided with something
*
* @param other The entity with which the ship has collided
*/
public void collidedWith(Entity other) {
// if its an alien, notify the game that the player
// is dead
if (other instanceof AlienEntity) {
game.notifyDeath();
}
}
}